Power hammer



.w. E. SHEEHY.

POWER HAMMER.

. APPLICATION FILED MAR. 2/, 1921. 1,428,612; v PatentedSept. 12, 1922.

3 SHEETS-SHEET 1.

' \nvenTor. William E. Sheehy Aflys.

i x i W. E. SHEEHY.

POWER HAMMER. APPLICATION FILED MAR- 2. .1921.

verbTor; Wil' Esheehy Patenfid Sept. 12;, 2.,

. 3 S H EET'S 3 SHEET$SHEET 3.

lnvenToT. William ESh'eehy AiTy.

Patented Sept. 12, 1922.

by AM W. E. SHEEHY.

POWER HAMMER. APPLICATION FILED MAR. 2,,1921.

Patented Sept. 12, i922.

Midi? 1,428,612 ai r ser s.

WILLIAM E. SHEEHY, or nnwrmrns, ew ansel-Iran, Assienon or ONE-HALF T LEONARD w. snnnnr, or NEWFiELDS, new HAMPSHIRE.

POWER. HAMMER Application filed March 2,

T0 (ZZZ whom it may concern: a

Be itknown that I, WILLIAM E. SHEEHY, a citizen of the United States, resident of Newfields, county of Roekingham, State of New Hampshire. have invented an Improve ment in Power Hammers, of which the following description, in connection with the accompanying drawing, is a specification, like characters on the drawing representing like parts. I

This invention relates to power hammers of the beam or helve type and it has for one of its objects to provide a power helve ham mer with novel connection between the crank shaft and the helve which will readily accommodate itself to different.thicknesses of work and different lengths of stroke.

Another object of the invention is to provide a helve hammer of this type with an improved form of anvil block and die and otherwise to improve power helve hammers all as will be more fully hereinafter set forth.

In order to give an miderstamling of my invention I have illustrated in the drawings a selected embodiment thereof, which will now be described after which the novel features will be pointed out in the appended claims.

Fig. 1 is a side view of a power hammer embodying my invention.

2 is a side view showing the base in longitudinal section and also showing the hammer in its lowered position in contact with the work.

Fig. 3 is an end view of the hammer with the portion thereof shown in section.

Fig. 4: is a top plan view of the die.

Fig. 5 is a section through the anvil block and die on the line 5-5, Fig; 2.

The base or frame on which the hammer is supported is indicated generally at 1 and 2 indicates the helve, which in this type of hammer is usually made of wood, and 3 indicates the hammer element secured to the outer end of the helve. The base or frame 1 is provided with the forked stand or support 3:, between the arms 5 of which the helve received and on which said helve is pivotally mounted. I

6 indicates the crank shaft by which the helve is operated, said c'ank shaft being driven by a driving pulley 8 which receives a driving belt 9. The driving belt made operative to drive the pulley 8 by means 1921. Serial No. 449,022.

of a belt tightener 10 which is actuated from a foot treadle 11. 7 indicates the anvil block on which the anvil die is supported.

The parts thus far described, with the exception of the frame, are or may be, all as usual in power helve hammers and form no part of my present invention.

1 preferably make the frame 1 with the two side members 12 of channel iron'and the stand at is formed with the portion 13 which fits between the channel members, said stand being bolted to the channel members bysuitable bolts 1%. At the front end of the frame the channel members are connected by a member 15 which is bolted thereto and to which the anvil block 7 is detachably secured by means of suitable bolts 16. The helve 2 is set into holder 1'7, the portion 1.8 of the helve, which is received in the holder, beingtapered and the socket of the holder being correspondingly tapered as best seen in Fig. 2. This holder 17 is provided with recesses 19 to receive hardened centers 20 on which the helve is pivoted, said centers being mounted in the arms 5 of the stand 4. vj

The body portion of each center 20 is square in cross section and each center is supported in a square socket formed in one of the arms Each arm is shown as having the removable cap portion 21 which is bolted to the arm 5 and which clamps the center in position. Each arm 5 is also formed with the flange portion in which is screwthreaded a backing screw 23 by which the center is positioned. A hardened washer 24: will preferably be provided between each screw and the corresponding center. This construction prov-ides for readily adjusting the centers to take up any wear.

The connection herein shown between the crank shaft Gand the helve 2 comprises two links and 26 pivotallyconnected at 27, the link 26 beingpivoted to an ear 28depending from thehelve and the link having a yielding pivotal connection with the helve. The crank shaft 6 is connected to the links 25, 526 at theirpivotal point 27 by means of a connecting rod 29. The link is pivotally connected at 80 to an eye bolt 31 whiclris slidably mountedin ears 32 depending from the holder 17, and said eye bolt has a collar 33 thereon and situated betweenthe collar and one of the ears 32 is a rubber buffer 34. The collar 33 of Cir the eye bolt is adjustable thereon by means of a nut 35 screw-threaded to the eye bolt. and said collar is normally so adjusted that the links 25, 26will stand in line with each other as shown in Fig. 1. The relation of the connecting rod 29 to the links 25, 26 is such that. the hammer will strike the anvil or the work thereon before the crank passes over its under center, and when the hammer has been brought to rest against the anvil or against the work to then further movement of the crank shaft to carry it over the dead center will carry the pivotal point 2'? between the links downwardly thus swinging the links out of line with each other and compressing the butler 34: as shown in Fig. 2. The links 25, 2G and the bulfer 34- provide, therefore, yielding connection between the crank and the helve which permits the hammer to accommodate itself to different thicknesses of work and which gives the hammer the necessary yielding or resilient action to produce a quick snappy blow.

It will be noted that one end of the link structure 25, 26 is connected to the helve through the lug 28 while the other end is connected to the holder 17, and therefore the strain incident to the crank passing around the under center would tend to force the helve backwardly into the holder. The taper construction of helve and holder prevent this action and retain the parts in proper position.

The anvil block 7 supports an anvil die. on which the work 10 is received. This die is indicated at 36 and it is carried by a support 37 which is so mounted in a holder 38 that the die can rock into different angular positions. The holder 37 is made with the semi-circular portion 39 which fits a correspondingly shaped recess in the car-- riage 38, this construction permitting the holder 87 to turn about its semi-circular surface to present the face of the die in different angular positions. One side face 40 of the portion 39 is inclined and the corresponding side face of the recess in which the holder 37 is received is under cut. as shown at 41. The holder is retained in the carriage by means of a key e2 which is driven into a slot 43 formed in the carriage and which engages the straight face 44 of the holder. 1

The key is formed at its small end with a lateral projection 5 5 which prevents the key from being entirely withdrawn from the slot when it is loosened and I will preferably make the key with a slight curvature longitudinally thereof so that when it is driven home, it will be straightened, thereby producing suflicient friction to retain the key in. place. The carriage 38 is provided with a well 50 which has an opening through the side of the carriage. The function of this well is to catch any dirt which may find its way into the recess in which the holder 37 rocks.

I claim.

1. In a power helve hammer, the combination with a frame carrying an anvil, of a helve member pivoted to the frame and carrying a hammer, two pivotally connected links, one of which is pivoted to the helve and the other of which has a yielding connection therewith, and a crank shaft connected to said links.

2. In a power helve hammer, the combination with a frame carrying an anvil, of a helve member pivoted to the frame and having a hammer, a crank shaft ournalcd in the frame, two lugs or cars depending from the helve, two pivotally connected links, one of which is pivoted to one of the ears and the other of which has a yielding connection with the other car, and a connecting rod connecting the crank shaft to said links.

3. In a power helve hammer, the combination with a frame carrying an anvil, of a holder pivoted to the frame, a helve carried by the holder and having a hammer, two pivotally connected links, one of which is pivotally connected to the liOlV and the other of which is yieldingly connected to the holder, a crank shaft and a connecting rod connecting the crank shaft to said links.

4:. In a power helve hammer, the combL nation with a frame carrying an anvil, of a holder pivoted to the frame, a helve member carried by the holder and provided with a hammer, two pivotally connected links, one of which is pivotally connected to the helve, an eye bolt slidably mounted in the holder and to which the other link is pivotally connected, said eye bolt having a collar, a yielding buffer between said collar and holder, and a crank shaft journaled in the frame and connected to the links.

in a power hammer. the combination with a hammer member, of an anvil block, a carriage thereon, having a semi-rir rular seat, one side face of which is under cut. a die holding member having a semi-circular portion to lit said seat, and having one side face inclined to fit the under cut face.

6. In a power hammer, the combination with a hammer member, of an anvil block, a. carriage thereon, having a. semi-circular seat, one side face of which is under cut, a die holding men'iber having a. Stfli'iil'i1f'llli\l portion to fit said seat, and having one side face inclined to lit the under cut face, and a key for holding the die-holding member in place.

In testimony whereof, .l have signed my name to this specification.

W .lLLl Aiii E. SHE EIHY. 

